Undertow

When Lyric Walker was 14 years old, her life was turned upside down when she witnessed a world-changing event - the arrival of the Triton, a five-nation race of warrior merpeople who walked out of the sea and camped on the beaches of modern-day Coney Island. Suddenly her neighborhood was home to a new minority group numbering in the tens of thousands. But the Triton's arrival also revealed a shocking family secret: Her own mother was a mermaid.

In the first book of Michael Buckley's Undertow Trilogy, the Alpha arrived, and the world was never the same. At the start of the second book, most of South Brooklyn is in ruins, and the nation is terrified. Nearly everyone that Lyric Walker loves is either missing or presumed dead, including the mesmerizing Prince Fathom. It's up to Lyric to unite the Alpha before the second wave of a cataclysmic invasion wipes out mankind for good.

After seven months as a captive of Minerva, the insane Alpha queen, Lyric Walker has escaped to the surface. Her only goal is to warn the world about the Great Abyss. When she finally arrives back in Coney Island, she discovers a world she never expected, one where humans and Alpha are finally working hand in hand to rebuild the country. But she soon discovers that an old enemy allied with an old friend may kill them all before the monsters get their turn.